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Finding the Fourth Proportional to 154,387, 213,054.06 and 83,731

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Solution

The fourth proportional to 154,387, 213,054.06 and 83,731 is: 115,548.78

Step by Step Solution

  1. Step 1: Write the proportion equation
    154,387 : 213,054.06 = 83,731 : x
  2. Step 2: Convert to fraction form
    154,387/213,054.06 = 83,731/x
  3. Step 3: Cross multiply
    154,387x = 213,054.06 × 83,731
  4. Step 4: Simplify right side
    154,387x = 17,839,229,497.86
  5. Step 5: Solve for x
    x = 17,839,229,497.86/154,387
  6. Step 6: Final answer
    x = 115,548.78

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.